Which of the following statements is true?

energy input is always greater than energy output.

magnetic fields are weakest at the poles of a magnet.

magnetic fields can push and pull protons.

a change in acceleration is called velocity.

This is what i found on google “according to the collision theory, the following criteria must be met in order for a chemical reaction to occur: molecules must collide with sufficient energy, known as the activation energy, so that chemical bonds can break. molecules must collide with the proper orientation.” i hope this information you.

Ithink the answer would be a